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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e606f24a72ceecc5208eb1a4f260ee13d3f002a503335fd7fc65cd76340c24' 
  AND token = '45JMMzqwX0ZKBS9QiZEgtozSrKErQh82L9BFSPmj68A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables